Accumulated Other Comprehensive Loss (Changes in the Balances of each Component of Accumulated Other Comprehensive Loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Nov. 30, 2020	Nov. 30, 2019	Nov. 30, 2018
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance	$ (15,506)
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	1,388	$ 2,130	$ 1,892
Income tax benefit (expense) related to items of other comprehensive income (loss)	1,897	2,197	(2,749)
Other comprehensive income (loss), net of tax	(5,127)	(5,941)	7,359
Ending Balance	(22,276)	(15,506)
Accumulated Define Benefit Plans Adjustment Member
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance	(15,506)	(9,565)
Net actuarial gain (loss) arising during the period	(8,412)	(10,268)
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	1,388	2,130
Income tax benefit (expense) related to items of other comprehensive income (loss)	1,897	2,197
Other comprehensive income (loss), net of tax	(5,127)	(5,941)
Ending Balance	(22,276)	(15,506)	$ (9,565)
Accumulated Define Benefit Plans Adjustment Member | Cumulative Effect, Period of Adoption, Adjustment
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance	$ (1,643)
Ending Balance		$ (1,643)